package org.example.blog.utils;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtParser;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.io.Decoders;
import io.jsonwebtoken.security.Keys;
import lombok.extern.slf4j.Slf4j;

import java.security.Key;
import java.util.Date;
import java.util.Map;

import static jdk.nashorn.internal.runtime.regexp.joni.Config.log;

@Slf4j

public class JwtUtils {

    private static final long expiration = 60 * 60 * 1000;
    private static final String secretString = "tlKmtbzHttHpPJF3LONQyYUaMt1PKN47uE1FME/zWj0=";
    private static final Key key = Keys.hmacShaKeyFor(Decoders.BASE64.decode(secretString));


    public static String genToken(Map<String, Object> claims) {
        String token = Jwts.builder()
                            .setClaims(claims) //设置载荷
                            .setExpiration(new Date(System.currentTimeMillis() + expiration)) //设置过期时间
                            .signWith(key) //设置签名
                            .compact();

        return token;
    }

    public static Claims parseToken(String token){
        if (token==null){
            return null;
        }
        JwtParser build = Jwts.parserBuilder().setSigningKey(key).build();
        Claims claims = null;
        try {
            claims = build.parseClaimsJws(token).getBody();
        }catch (Exception e){
            log.error("解析token失败, token:"+token);
        }
        return claims;
    }

    public static Integer getUserIdFromToken(String token){
        Claims claims = parseToken(token);
        if (claims==null){
            return null;
        }
        return (Integer) claims.get("id");
    }

}
